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This can build on the great work Cliff already did in v1, with enhancements taking inspiration from MCPJam like a view that shows mobile, tablet, desktop sizing.
When the stable version of MCP Apps gets released, this can get bumped up (no official date but we can use what's in the repo now as a starting point along with WIP docs).
Scored 5/16 with the priority rubric added to AGENTS.md in #1891. This card is already approved and sitting in Todo — only Priority was set here, its Status is unchanged.
Axis
Score
Reasoning
Severity / impact
2/5
Specification and design work for MCP Apps testing. No user is blocked; this defines future capability.
Urgency / staleness
2/5
v2.4.0 milestone — the furthest-out bucket, with no dependency forcing it earlier.
Signal bonuses
+1
milestone (v2.4.0) (+1)
Total
5
Lands in the Low band (5 or below).
Related issues. These look connected and may be worth reading together:
@olaservo can you say more about what your vision for this spec? Maybe we should make it an agenda item for the next meeting. I definitely feel that providing the input form and bringing up the app is a very minimal implementation and an area we should focus on more.
I need to spend more time in the MCP Apps spec to see what things there are that we could provide a window into or handle on.
Inspection into things like the sandbox and app frames' CSP and anything else we can surface about them (getting them out of whack is a nightmare to troubleshoot, and would still require browser devtools. Surfacing everything possible that could keep you from having to open that panel should be on the table.
UI affordances for
Previews: mobile, tablet, desktop (as you mentioned)
Activity
olaservo commentedon Jan 21, 2026
When the stable version of MCP Apps gets released, this can get bumped up (no official date but we can use what's in the repo now as a starting point along with WIP docs).
[-]Placeholder: MCP Apps Testing Spec[/-][+]MCP Apps Testing Spec[/+]cliffhall commentedon Aug 1, 2026
Triage: Priority = Low
Scored 5/16 with the priority rubric added to
AGENTS.mdin #1891. This card is already approved and sitting in Todo — only Priority was set here, its Status is unchanged.Related issues. These look connected and may be worth reading together:
Scores are a starting point, not a verdict — the rubric is meant to be overruled when it's plainly wrong, provided the reason is written down.
cliffhall commentedon Aug 22, 2026
@olaservo can you say more about what your vision for this spec? Maybe we should make it an agenda item for the next meeting. I definitely feel that providing the input form and bringing up the app is a very minimal implementation and an area we should focus on more.
I need to spend more time in the MCP Apps spec to see what things there are that we could provide a window into or handle on.
2 remaining items